Improvement in tuyeres



THOMAS BIRCH.

Improvement in Tu yer es.

Patented Jan. 2, 1872.

- Wifn/ess as Jvg/M I Ulvrrnn S'rn'rns rrrcn.

nrniv 'r THOMAS BIRCH, OF ERIE, PENNSYLVANIA, ASSIGNOR TO HIMSELF AND WILLIAM R. STEARNS, OF SAME PLACE.

IMPROVEMENT IN TUVERES.

Specification forming part of Letters Patent No. 122,430, dated January 2, 1872.

To all whom it may concern.-

Be it known that I, THOMAS BIRCH, of Erie, county of Erie, State of Pennsylvania, have invented certain new anduseful Improvements in Tuyeres, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing making part of this specification, in which Figure 1 is a perspective view of my improved tuyere, and Fig. 2 is a vertical section of the same.

Similar letters of reference denote corresponding parts in both figures:

The invention consists in making the operative parts of the tuyere in two pieces of a pcculiar shape, having a particular adaptation to each other, whereby certain advantages are attained, as will be fully explained.

In the drawing, A is the shell or body. It may be made either in globular form, of two conical sections cast in one piece, as shown, or united at their bases by a joint, or in the shape of a cylinder, as may be preferred, although that represented in the drawing is deemed best. The shell is provided at the lower side with a flange, A by which it may be secured in position, and also with a short section of pipe, A which serves as an inlet through which the blast is received from the bellows. a a are guiding-fins or webs, projecting from the inner face of the upper part of the shell on radial lines, the inner vertical edges of the web being concentric, or thereabout, to the shell, their form and arrangement being plainly shown in Fig. 2. The upper end of this valve is of greater diameter than the aperture in the upper side of the shell, and is convex upon its upper face,'the overlapping portion of the shell conforming thereto in its out line, in such manner as to form an annular space or throat, to, through which the blast is delivered in converging lines, whereby the strength of the blast and the consequent intensity of the heat at the point of divergence is greatly increased. When preferred, I can so construct the parts as to make their throat narrowest at thepoint of delivery. The upper end of valve B is maintainedin a centralposition relative to the mouth of the shell by means of the fins or guides a a, being of such diameter as to fit closely within them. The lower end of the valve closes the lower aperture of the shell, as in Fig. 2, both parts of the joint thus formed being beveled, in order to insure accuracy of fit for the purpose of preventing any escape of air at this point. 0 is a lever pivoted to alug, a, projecting downward from flange A, the inner end being pivoted to valve B. In the drawing the lever is pivoted to a girt or rest which spans the open end of the valve, as, in practice, I prefer to castit(the valve) hollow; but any desired method of connecting the lever with the valve may be adopted.

By casting the valve with a rim, b, at the lower end, and then turning up both the rim and the corresponding face of the shell in a lathe, a very close air-tight joint may be readily made.

I regard the hour-glass form of valve shown as being preferable to any other, because it offers but little obstruction to the current delivered from the blower; hence the blast is delivered with nearly uniform strength from all sides of the throat, and I may, if 1 find it practicable, form the upper and lower portions of the valve in separate pieces, uniting them by a small stud or standard, and operating themsimultaneously by lever G.

The fins or webs a, in addition to supporting or guiding the upper end of the valve, serve to check any whirling motion of the air within the shell, and to compel a uniform and steady delivery of the blast, and the conical shape of the upper part of the air-chamber causes the air to flow to the throat a without material change in direction.

By vibrating the valve up and down by means of the lever the fire may be freed of the ashes and dirt while a heat is being taken, and such refuse matter as passes down into the shell will be immediately discharged from the bottom. i

The number of fins or webs a may be increased, they being placed near enough together to form a guard which shall prevent the passage of any larger slate or clinker than can escape from the lower opening of the shell.

Having now described my invention, what I claim as new, and desire to secure by Let ters Patent, is--- The herein-described tuyere, composed of two pieces, namely, an outer shell, A, of globular or reverse-d conical-form, provided with internal radial fins or webs a, and an inner hourglass-shaped valve, B, formingwith the shell, the throat a, closing the lower outlet, and operated by a lever, O, substantially as set forth.

Witnesses: THOMAS BIRCH.

S. S. SPENCER, WILSON KING, W. L. CLEVELAND. 

